Bumped deps, officially only supporting 1.20.6+

Changed event priority to MONITOR to reflect that no modifications take place, and to try and help guarantee checking isCancelled will most likely return the correct result.

Fix command for backport to Java 8
Uploaded the CORRECT resource this time

Fixed command alias "bh" to be "bm"
Bumped Hukkit version
Project source is now Java 8 for compatibility

Fixed potential issue with /bm command due to backporting to Java 8.